We have a 2 year old female who is/was a runt, and not expected to survive. She is the size of a kitten and not the sharpest tool in the box! 
She goes outside during the day but we lock her in at night. Recently, we've been getting phone calls (phone number on her collar) from concerned members of the public who have encountered her in town, wandering in and out of the road 
It seems that she is straying further and further from the house and I'm so scared she will be run over, as it seems she has no road (or any) sense!
Any tips, apart from keeping her inside full time (which we don't want to do as she LOVES going out and paws at the cat flap every morning until we open it)